Volume governor



Sept. 15, 1959 R. JOHANSSON VOLUME GOVERNOR Filed Jan. 25, 1955 6 4. a 5 3 M 2 8 0 9 3 2 W Z M M r \\\\\\w\\ 6 i a F 5 VOLUME GOVERNOR Rolf Johanss'on, Jonkoping, Sweden, assignor to Aktiebolaget Svenska Flaktfabriken, Stockholm, Sweden Application January 25, 1955, Serial No. 484,044 Claims priority, application Sweden July 28, 1954 2 Claims. (Cl. 137-'499) The present invention relates to an improved device for maintaining the volumetric flow of a gaseous medium at a constant value.

The device consists of a tube, the bore of which is covered by a plate having sector-shaped openings and a circular damper disk arranged parallel and adjacent to said plate and pivoted for rotation on a central axis. The damper disk is provided with sector-shaped cut-outs corresponding in number to said openings. The disk has a downturned flap at one side of each cut-out and is provided with a spring bias tending to hold the disk in its initial position. In accordance with the invention, the bias means comprises an arcuate spring of steel wire fastened at one end to the damper disk and at the other end to a lever which is rotatable about the same axis as the damper disk and may be locked in different positions. The other end of the lever cooperates with a scale on the tube for indicating the value of the volumetric flow.

The objects of the invention are set forth more fully hereinafter and the details of the construction of the illustrated embodiments are set forth with reference to the accompanying drawing, wherein:

Fig. 1 is a transverse sectional view through a device embodying the present invention;

Fig. 2 is a plan view of the device: and

Fig. 3 is a plan view of the damper disk removed from the device.

In the drawing, the volume regulator is mounted in a tube 1 through which the gaseous medium to be governed flows in the direction indicated by the arrows 2. The bore of the tube is covered by a plate 4 having a plurality, in the present instance, two, sector-shaped openings 3. In the illustrated embodiment of the invention, the plate is mounted at one end of the tube and is provided with a flange 5 having holes 6 for suitable fasteners. Just below the plate 4, a rotatable damper disk 7 is provided having sector-shaped cut-outs 20 corresponding in number to the number of the openings 3. In the center of the damper disk, an axle spindle 8 is mounted having pointed ends seated in adjustable bearings 9 and 10. The bearing 9 is threaded in a bushing 11 fastened to the plate 4, and the bearing is mounted in a cross bar 12 fastened in the tube by means of screws 13.

In accordance with the invention, the damper disk 7 has a downturned flap at one side of each cut-out which cause the disk to turn clockwise at shown in Fig. 2 by the pressure of the flow of the gaseous medium against tates Patent 0 the flaps. This tendency to turn is counteracted by a spring 15 which, in the present instance, is made of annular steel wire. One end of the spring at 16 is fastened to the damper disk and the other end at 17 is fastened to one end of a lever 18 which is mounted for rotation about the same axis as the damper disk and is provided with means for looking it in different positions. The opposite end of the lever extends into registry with a scale on the plate 4 and has an index for indicating the value of the volumetric flow.

In the illustrated embodiment of the invention, as shown in Fig. 3, the damper disk 7 is formed of sheet metal. The flaps 21 are integral with the disk and are formed by bending down along the line 21.

While a particular embodiment of the present invention has been herein illustrated and described, it is not intended to limit the invention to such disclosure, but changes and modifications may be made therein and thereto within the scope of the following claims.

I claim:

1. In a device for maintaining the volume flow of a gaseous medium at a constant value comprising a tubular element, a fixed flat plate covering one end of said tubular element, means in said fixed flat plate defining a plurality of sector-shaped openings, a circular damper disk underlying said plate and means rotatably mounting said disk on its central axis, means on the said damper disk defining a plurality of sector-shaped cut-outs in a number corresponding to said openings and arranged to register with the latter, a downturned flap at one side of each cut-out of said damper disk projecting into the flow of medium through said openings and cut-outs; a regulator for said damper comprising a lever mounted for rotation coaxially with said circular damper disk, means to lock said lever in diiferent positions, a scale mounted on said tube underlying said lever for indicating the position of the latter, and an arcuate spring of steel wire disposed above said fixed flat plate and encircling said sector-shaped openings out of the flow of medium through said openings and cut-outs, said spring being mounted at one end to said damper disk, and connected at the other end to said lever to thereby tend to hold said disk in its initial position against rotation by the flow of gaseous medium against said angularly projecting flaps to thereby maintain the flow at a constant value, determined by the position of said lever.

2. Apparatus according to claim 1 wherein said flaps correspond in dimensions to the dimensions of said cutouts and are formed integrally with said disk.

References Cited in the file of this patent UNITED STATES PATENTS 6,820 Barnard Oct. 23, 1849 917,300 Hughes Apr. 6, 1909 1,285,192 Hunt Nov. 19, 1918 1,482,547 Dell Feb. 5, 1924 1,898,244 Dodrill Feb. 21, 1933 2,237,013 Stanbery Apr. 1, 1941 2,698,509 Van Valkenburgh Jan. 4, 1955 

